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https://issues.apache.org/jira/browse/OPENJPA-2555?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16682572#comment-16682572
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Mark Struberg commented on OPENJPA-2555:
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Cool, thanks a lot!
I've now finished my work on getting the openjpa ready to be tested via Docker.
All tests are now green!
I assume you have docker set up to run as group {{docker}} and you made
yourself part of this unix group. Otherwise you need to start docker via sudo.
Starting PostgreSQL via Docker:
{noformat}
$> mvn -N -Ptest-postgresql-docker docker:start
{noformat}
The default Postgres version is 11. To specify a different one you can add the
following property to your maven call: {{-Dpostgresql.server.version=9}}
To stop postgres just call
{noformat}
$> mvn -N -Ptest-postgresql-docker docker:stop
$> mvn -N -Ptest-postgresql-docker docker:remove
{noformat}
the {{-N}} stands for non-recursive, otherwise it would go through all
sub-projects with that command.
> Timestamp precision from manual schema not respected
> ----------------------------------------------------
>
> Key: OPENJPA-2555
> URL: https://issues.apache.org/jira/browse/OPENJPA-2555
> Project: OpenJPA
> Issue Type: Bug
> Components: jdbc, jpa, sql
> Affects Versions: 2.2.2, 2.3.0
> Reporter: Ancoron Luciferis
> Assignee: Mark Struberg
> Priority: Major
> Fix For: 3.0.1
>
> Attachments: 2.2.x-Enable-timestamp-precision-handling.patch,
> 2.3.x-Enable-timestamp-precision-handling.patch,
> openjpa-2.2.x-Enhance-timestamp-precision-handling.patch,
> openjpa-2.3.x-Enhance-timestamp-precision-handling.patch,
> openjpa-trunk-Enhance-timestamp-precision-handling.patch,
> timestamp-scale-preserve-default-behavior.patch,
> trunk-Enable-timestamp-precision-handling.patch
>
>
> The use cases here are the following:
> # JPA entities are to-be-created for an existing database schema which
> includes several timestamp columns with explicit precision
> # A developer wants to specify timestamp precision inside JPA entities to
> better specify column data type information for the generated schema
> \\
> In both cases, the result will be that any query executed for a timestamp
> column that is configured for less than millisecond precision (e.g. deci- or
> centi-seconds) will fail to find appropriate rows.
> One of the reasons for that is that the precision used for rounding a
> timestamp value before it goes into a query is configured for a whole
> database type (using the dictionary) or the whole persistence context (using
> the configuration parameter).
> This makes it impossible to have different column configurations, e.g. some
> without any precision declaration (where it's not important) but some with.
> In addition, the default precision for the standard timestamp data type is 6
> (microseconds), which is not respected by some databases (most prominently
> MySQL, which defaults to a precision of "0" instead).
> However, even if respected, when using timestamps generated by the database
> itself, which include the relevant precision, using those values for later
> comparison often fails because of precision mismatch and also for different
> behavior of different databases regarding fractional handling and the way how
> comparisons on timestamps work.
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